I found tzatziki sauce in a supermarket, and if I recall correctly, the ingredients included onions; I then read on Internet that tzatziki sauce is made with garlic.
What do you use to make tzatziki? Onions, garlic, or both?

Also one may want to drain the yogurt first to make the sauce a little thicker (well potentially a lot thicker).
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PointyJul 26 '10 at 21:57

1

or just use the greek style yogurt if you lack the cheese cloth to drain it yourself.
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sarge_smithJul 26 '10 at 23:54

Can pour a whole tub of yogurt in a large coffee filter inside a funnel too. Let drain overnight and you're good to go. Oh, and you MUST squeeze all the water out of the cucumbers too.
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Rake36Aug 12 '10 at 1:30